I find the actual topic of this thread to be useful. According to the original post, this thread is about the former TSA head's comments. Through this discussion, I've come to the conclusion that trying to bring a knife on a plane is not worth the risk. The terms of the TSA's rules are too onerous. Of course, you can bring a knife you don't care about losing. I personally never carry a knife I don't care about losing.
Anyway, what I usually do is start a new thread if I don't like a thread's topic.
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If you're reading this, it's too late.